Explicilty define exported exceptions

DimitriPapadopoulos · arthurdejong · commit dcdb5c9bdd20 · 2021-08-10T13:59:01.000+02:00
LGTM alert: Import pollutes the enclosing namespace See: https://lgtm.com/rules/3980091/ Closes arthurdejong#270
diff --git a/stdnum/exceptions.py b/stdnum/exceptions.py
@@ -25,6 +25,10 @@
 """
 
 
+__all__ = ['ValidationError', 'InvalidFormat', 'InvalidChecksum',
+           'InvalidLength', 'InvalidComponent']
+
+
 class ValidationError(Exception):
     """Top-level error for validating numbers.
 
